An antifreeze method for air intake shafts of underground mines in alpine regions

Abstract

The invention discloses an anti-freezing method for an entering wind shaft of an underground mine of a high and cold area. An adopted anti-freezing system is constituted by a preheating unit (15), anair curtain unit (18), an annular jet flow wind gap (19), a fan device, a wind door, sensors and a PLC control system (14) which are combined; the preheating unit (15) is arranged on the wellhead surface of an entering wind well (2), and the air curtain unit (18) is arranged on the wellhead surface of an auxiliary well (1); the annular jet flow wind gap (19) is formed in a shaft of the auxiliary well (1); and the PLC control system (14) is connected with all the sensors, receives data collected by all the sensors and conducts regulation control on operation of the preheating unit (15), the aircurtain unit (18), a fan and the wind door. According to the characteristic that the day and night temperature difference change of the underground mine of the high and cold area causes change of thewind flow direction of a ventilation system, normal ventilation and inverted ventilation state freeze prevention of the entering wind shaft in day and night divided periods are achieved, preheating energy consumption of a preheating system is reduced remarkably, personnel heat comfort is improved, occupational health and safety are achieved, the requirement for the wind required amount of ventilation is met, and the problem of well freezing of the shaft of the auxiliary well is also economically and reasonably solved.

Description

technical field [0001] The invention belongs to the technical field of mine ventilation and environmental protection, and specifically relates to a method for solving the problem of freezing shafts of mine air intake shafts in alpine regions, and is particularly suitable for antifreezing of air intake shaft shafts where ventilation systems enter air through air intake shafts and auxiliary shafts. Background technique [0002] The air intake shafts of underground mines mainly include auxiliary shafts and air intake shafts. In mines in high-altitude and cold regions, about 80% of underground mines have air intake shafts that suffer from freezing disasters. The cold and low-temperature air on the surface enters along the air-inlet shaft, and encounters the cooling effect of the low-temperature rock temperature in the air-intake shaft. The cold air condenses and freezes on the wall of the air-intake shaft, cables, pipes and other equipment in the shaft, which seriously affects th...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of freezing well disasters in the auxiliary shafts of underground mines and the air intake shafts of the air intake shafts in the alpine regions in winter, and the existing technical solutions have high energy consumption for preheating and antifreezing, and the surface of the auxiliary shaft and the inside of the shaft The location of the installation space is limited, the process of conveying hot air affects the thermal comfort of personnel, affects occupational health and safety and other technical problems, as well as the potential heat potential contained in the anti-air flow, and provides an antifreeze method for the air intake shaft of underground mines in alpine regions. This method can realize the normal ventilation of the air inlet shaft in diurnal and night-time periods and anti-freezing in the anti-wind state according to the characteristics of the change in the air flow direction of the ventilation system caused by the change in the temperature difference between day and night in the underground mine in the alpine region.

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